Sleeping bag



FIG. 1 is a top plan view of a sleeping bag showing our new design;

FIG. 2 is a left side elevational view thereof, the right side elevational view being the same;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is an upper end elevational view thereof;

FIG. 5 is a lower end elevational view thereof. 

The ornamental design for a sleeping bag, as shown and described. 